This is where the harmonic balancer comes in. The circular device, made of rubber and metal, is bolted at the front end of the crankshaft to help absorb vibrations. It's usually connected to the crank pulley, which drives accessories like the air conditioner.
Additional costs: Ground water wells can also be tested for radon, then, if needed, can get a water radon mitigation system installed. Installing a water radon mitigation system runs from $1,000-$4,500, and maintenance runs $0 to $150 annually.
Mitigation is a reduction in either the quantity or quality of a punishment, for example, a punishment of correctional custody for 20 days reduced to 10 days or to restriction for 20 days but the days cannot be more than previous days.